Contents
Which is encoder mode does the STM32 timer use?
As we’ve discussed in an earlier tutorial, the timer modules can operate a variety of modes one of which is the Encoder mode. Where the timer gets clocked from external channels’ pins and the programmer (you) have the ability to select the counting edge polarity, Prescaler value, and the input filter cycles.
How is the direction of motion detected in STM32?
Each channel provides a specific number of equally spaced pulses per revolution (PPR) and the direction of motion is detected by the phase relationship of one channel leading or trailing the other channel.
How is the Dir bit calculated in STM32?
Depending on the sequence the counter counts up or down, the DIR bit in the TIMx_CR1 register is modified by hardware accordingly. The DIR bit is calculated at each transition on any input (TI1 or TI2), whatever the counter is counting on TI1 only, TI2 only, or both TI1 and TI2.
How is an incremental encoder connected to the MCU?
An external incremental encoder can be connected directly to the MCU without external interface logic. In this LAB, our goal is to build a system that initialized timer2 in Encoder mode. Then read its counter value continuously and send it to the PC via serial port as well as the encoder’s push-button state.
How to set up timer in STM32 board and Hal?
OS is Linux (Ubuntu 15.04). Kindly suggest. Best way is to set up a timer in encoder mode to count the pulses of your sensor. If you have both A and B pulses then choose encoder mode TIM_ENCODERMODE_TI12 if only pulse A then TIM_ENCODERMODE_TI1.
What should Tim _ resetcounter look like in STM32?
So a TIM_ResetCounter should look like this: If you check in the reference manual, you can see that the counter value register has read-write access. So you can set it to 0. You can create a general set function as well with an additional “value” parameter.
What should counter rate be in STM32 board?
The counter rate should be slow enough to not roll over in the period between tach pulses for the slowest speed that you intend to measure. And the counter rate should be fast enough to provide sufficient time resolution between tach pulses for the fastest speed that you intend to measure.